AMPEREX Electronics Corporation
A North American Philips Company
Hicksville, NY
Invented and Manufactured Electron Tubes such as the famous 6DJ8, and also manufactured semiconductors under both the AMPEREX and PHILIPS trademarks.

more info coming using dialup so editing is slow

Originally located at 79 Washington Street in Brooklyn, New York, Amperex was a long established manufacturer of transmitting tubes when they were acquired by the giant Dutch firm, Phillips in 1955 or so. Phillips continued to improve and enlarge the transmitting plant in New York, but also used the Amperex name to distribute their fine new line of Dutch made minis, (12AX7, 12AU7, 12AT7) to feed the booming U.S. Hi-Fi market.
Classic Hi-fi brands such as Marantz, Fisher, Scott, etc... owe a large part of their great sound to these tubes.
And of course we can't forget the 6DJ8, 6922 & 7308 frame grid tubes. Developed by Amperex in 1958 when transistors were already starting to take over the electronics industry & originally developed for video & radar use, the 6DJ8 has come into heavy use in audio over the last 15 years. And Amperex definitely made some great ones like the Original "Bugle Boy" series with it's seemingly, magical ability to filter out noise like the Mullards do, and the later, map versions with their full, balanced sound, black background, and great sound staging.